1399389816 has 64 divisors (see below), whose sum is σ = 4041031680. Its totient is φ = 399111680.

The previous prime is 1399389787. The next prime is 1399389869. The reversal of 1399389816 is 6189839931.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151416 + ... + 160391.

It is an arithmetic number, because the mean of its divisors is an integer number (63141120).

Almost surely, 2^1399389816 is an apocalyptic number.

It is an amenable number.

1399389816 is an abundant number, since it is smaller than the sum of its proper divisors (2641641864).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1399389816 is a wasteful number, since it uses less digits than its factorization.

1399389816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311844 (or 311840 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 57.

The square root of 1399389816 is about 37408.4190524005. The cubic root of 1399389816 is about 1118.5263932034.

The spelling of 1399389816 in words is "one billion, three hundred ninety-nine million, three hundred eighty-nine thousand, eight hundred sixteen".